Bevel, protractor, and calculator



Aug- 4, 1942. w. THOMAS BEVEL, PROTRACTOR AND CLCULATR` 2 Sheets-Sheet 1 Filed Mal-ch 2o, 1941 www Y It. Tha/ams awww Aug. 4, 1942. w. THoMAs BEVEL, PROTRACTOR AND CALCULATOR Filed March 20, 1941 2 Sheets-Sheet 2 amando/0 W 11110111115 Patented Aug. 4, 1942 UNITED STATES PATENT OFFICE anvar., PaorRAo'roa, AND CALCULATOR William Thomas, South San Francisco, Calif. Application March 2o, 1941', serial N0. 384,419

l(ol. 33 75) 3Claims.

This invention relates to a tool for use by mechanics for finding an angle, the degree of an angle, the pitch, the rise, the sine, the cosine, the versed sine, the length of an arc, degree and radius, and radius of any length or degree.

More particularly, it is an aim of the invention to provide a device which will be particularly useful to carpenters in laying out wor-l:

. and in checking from blueprints, and which is also well adapted for use by other classes of mechanics such as boiler makers, shipbuilders, machinists, blacksmiths, structural i workers, ornamental iron workers and the like.

Other objects and advantages of the invention will hereinafter become more fully apparent from the following description of the drawings, which illustrate a preferred embodiment thereof, and wherein:

Figure 1 is a top plan view of the device,

Figure 2 is an edge view in elevation of the wider than the slot I8, for a purpose which will hereinafter become apparent.

The tongue I2, at its inner end, is enlarged to provide a semi-circular portion I i? which is partially disposed between the inner` ends of the bar sections I3 and Ill. Bar sections it and I4. are provided with alin'ed openings ZEE which are adapted to be alined with an opening 2i in the inner-end of the tongue vi2 for receiving a bolt 22 for pivotal'ly connecting the body II and tongue I2 and which is provided with a thumb nut, 23 for holding said parts in adjusted positions relatively to each other. The opening 2| is centrally disposed relatively to the outer edge of the semi-circular portion I9. The bar I4 at its inner end and on its upper side is provided withan arrow,24 which alines with the inner edge of the tongue I 2 and the axis of its opening 2 I and the head of which same, looking toward the outer edge of the body portion of the device,

Figure 3 is a longitudinal sectional view taken substantially along the plane of the line 3-3 of Figure 1,

Figure 4is a transverse sectional view taken substantially along the plane of the line 4-4 of Figure l,

points toward the outer rounded edge of the portion I9. Theupper side of the semi-circular portion I3 is calibrated in degrees and provided with degree markings, as seen at 25 to combine -with the arrow 24 to form a protractor.

The portion I9 combines with the spacing block I6 to form the space ,26 between the bar sections I3 and I4. A bolt 2'I is provided with a `head 28fwhich is sized to slidably engage the Figure 5 .is a fragmentary bottom planview I of a, portion of the device,

Figure 6 is a transverse sectional view taken substantially along the of Figure l, and

Figures 7, 8 and 9 are plan views illustrating various applications and uses of the invention. Referring more particularly to the drawings, wherein like reference characters designate like or corresponding parts throughout the different views, I Il designates generally the bevel, protractor and calculator in its entirety and which includes a bar II .forming .the main body portion ofthe tool andatongue I2.

The body II includes a lower bar section I3 and an upper bar section I4, as best seen in Figure 4, which sections are vconnected at their -outer ends by fastenings Ii. 4il spacing strip or block I 6 is disposed between the outer ends of the sections I3 and I4 andsecured in position by the fastenings I4 which extend thereplane of the line B-- slot Il. The shank of the bolt 21 projects upwardly through the slot I8 and is provided with an enlarged inner squared portion 23 having an inner circular portion 29' and an outer, cirvcular threaded portion 30. An arm 3| has an opening 32 at one end thereof for loosely en- 35 gaging the portionls, adjacent the head 28. A

through. The bar sections I3 and I4 are pro" ment. As best seen in Figure 4, the slot ills washer 33 is provided with a hub portion which depends downwardly therefrom and which is provided with a squared bore 34 for engaging the squaredportion 29 for keying the washer 33 thereto. A thumb nut 35 is mounted on the threaded portion 30 'for holding the parts connected. As best seen in Figure 1, the washer 33. the body portion of whichv is disposed above the bar I4, is provided with diametrically opposed outwardly projecting pointed extensions 36,. and the squared portions 29 and 34 are provided so that the washer 33 can be held in` a position so that the extensions 36 will point transversely of the bar Il. The under, outer; side of the head 28, as bestvseen in Figure 5, is provided with a line 31 which'is disposed transversely of the barII and which is provided with'arrow tipped ends.

The tongue I2 is provided with an apertured ear 38 which projects from the inner edge of A 21, and parts mounted thereo er end of the bar II, the

, I2 relatively to each away from the bar .I I.

' hypotenuse of .beyond the outer .amount or 30 degrees.

` rect cosine and verse drawn. .The tool its inner end vand which',

is of a thickness sub'l thertongue, adjacent as bestseen in Figure 6,

-stantially less than that of the tongue I2. The;`

ear 33 is offset downwardly relatively to the@ upper side of the tongue I2 tol receive the appa- 5 site end of the arm 3| which isf on and which iszpivotally connected thereto by a fastening 39 which is countersunk in the ann 3| and the ear 33. The combined thickness of In ligure '1, the w01 lo is shown applied with the bar II thereof having its innerside alined with the -rise 41v of a right angled triangle A and with the inner edge of the tongue I2 alined with the ear 33 and the arm 3| substantially corre- 1o the'hypothenuse 43 of the triangle A. With the sponds to that of the tgl/ligue .I2 and likewise to parts II Vand l2 thus disposedthe arrowv 24 will the width of the slot 23 so that when the tongue be pointing tothe calibrations 25 designating the I2 is swung toward the bar II, to. move the bolt Vteward the outear tioned end of the arm 3| can be moved into the slot 23 together with the tongue I2. It will thus be apparentthat movement of the parts II and other will likewise 'move the bolt 21, and parts carried the bar II so that when the tongue I2 is moved toward the bar II the parts carried by the bolt 21 will be moved outwardly of the-bar II and inwardly thereof when the tongue I2 is moved The upper side of the tongue I2, along its Outer edge is provided with calibrations 40 indicating the degrees of an arc and along its inner edge is calibrated at 4I for ascertaining the length. of e an arc to atwelve inch radius. Other calibrations, not illustrated, may be inscribed on the back side of the tongue I2 for ascertaining the radius, chordand ordinate. The upper side of the bar section I4, along its inner edge is provided with markings 42 for ascertaining the a' right angle vtriangle and .with markings 43 forming pitch f markings for ascerq" taining the pitch o'r slope of a surface. The viupposite, outer edge of the bar section I4 is pro'- vided with the markings 44 for indicating the rise on a twelve inch base and which are arranged in proper relationship to the markings 42 and 43, as will hereinafter become apparent. The upper side of the outer edge of the bar section I3, which is exposed and which projects edge of the bar section I4, is inscribed, as seen at 45, for ascertaining the sine.

The reverse side of the bar section I3 is pro-- videdwithmarkings. 4not shown, for indicating cosines and versed sines.` f The bar section I3 is preferably provided with depending flanges 43, as bestseen in Figure 4, for holding the7 under side' of'the bar I3 andthe head 23 out of engagement with a surface on which thev device I II is resting. For example, the degree fora plate for a. cone of, for example, degrees, is three times this The tongue I2 can be adjusted until the arrow 24 points to the 30 degree marking 25. This will result in thearm 3l moving the parts carried by the bolt 21 Auntil the. arrow 33, which points toward the outer edge of the bar section I3, is inalinemen-t with the correct sine calibration 45 and the arrows formed by the line 31 will be vindicating the cor-'l of the bar section I3,'-and which are'not illus- .trated. By vthen consulting the tables, .not shownen the `reverse side of the tongue I2 the chord, ordinate and arc may be ascertained and is also capable of. being used for finding the length of arcs lof any radius and degree. For example, the length of an arc of 45 degrees having a 9 foot radius can be as. certained by consulting the markings 3 and last men 15 angle A is 12 inches therebyfenthlvise of substantially in if la figure B having manner previously es. d sine on the opposite side formed by the sides 41 and that the base 43 of the trilong the point 33 to the left Figure 1 will indicate length of the side inches,

degree of the angle 43. Also assuming of the slot I3, as seen in the rise of the triangle or the 41. Assuming that this happens tobe 4 the other oppositely disposed point 33 will be with indicia 12.6'

alinement inches o f the markings 42 to indicate the length of the line 48 or the hypotheiise of' triangle A. Likewise, the tool I0 can obviously be adjusted to ascertain the-degree of the angle indicated by 5 the line 60. I'he device I0 can also be used, as illustrated in Figure 8, to ascertain the degree of angle of a vbrace 3l relatively to a member 32 The tool Illv will also indicate the pitchby means of the markings 43, as for example) with a 12 'inch base and a a inch rise, with the device n adjusted, one of the points 33 will be over the marking indicating 3-of'the calibrations 44 while the other point 36 will substantially aline with 35 the marking 43 designated 1/6 to indicate. the ratio of the pitch. l v In Figure 9, the device 131s shown applied to an arc 53 and a chord 34 and `with the device I0 applied between the chord 4o' and-a line drawn fromthe center of the arc 53 to `one end of the chord and in which position the tongue and bar I2 and II, respectively, will be positioned so that the length of the arc 53-hav ing a known radius can be ascertained in the gree of the arc and employing the calibrations 43 and 4I to then ascertain thelength of the arc. The length of the chord 54 and of the ordinate Si can 4then be obtained byuse of the tables onA the reverse sideof the tongue I2.

The bolt 21 is disconnected from the nut 33 and the fastening 33 is removed for detaching the arm 3| when it isdesired to use th'e device I3 in the manner, as illustrated in Figure '1.

.Various other uses of the device I3 will be obvious'to the skilled mechanic.

Various mod'ications and changes are con-` y templated and may obgiously lie-resorted to as @only a preferred embodiment of the invention has been disclosed..

I claim'as my invention:

1. A- device fof the character described comprising an elongated bar forming a body member, said bar being fo med of coextensive sections, an eldngated mem r forming a tongue, one end of said-tongue being pivotally mounted on said -bar and turnably. disposed between corresponding ends of the sections thereof, a slide mounted to move longitudinally of said bar,l an arm pivotally connected at one end to said tongue andplvotally connected at its .opposite end to said slide, said slide including transversely projecting pointers, A

and said bar sections beingv provided with indicia, arranged .on either side of said slide forin- 43 and dicating the rise on a 12 inch base, andthe hy- Y I By multiplying this. the radius, it can be described by obtaining the depothenuse and pitch of a 12 inch base, having a given rise, said tongue being provided at its inner, pivoted end with a semi-circular portion provided with degree markings,4 and the upper bar section being provided with an arrow inscribed thereon and arranged in relationship to said degree markings to form a protractor for indicating the angle formed by the bar and tongue, to permit the device to be set, when the base it 12 inches and the angle formed by the base and hypothenuse'is known, so that the de-v vice will indicate the rise, hypothenuse and pitch.

2. A device of the character described comprising a bar formed oi coextensive sections arranged in superposed spaced relationship, an elongated member forming a tongue having one end disposed between and pivotally connected to corresponding ends of said bar sections, said bar having related scales for indicating the rise, hypothenuse and pitch of a triangle having a 12 inch base, a slide mounted in the sections for movement longitudinally of the bar, pointers carried by the slide for indicating related markings of the scales when the sildeis moved to any poers and provided with a squared bore, the shank of the bolt having a squared portion for engaging said squared bore, for preventing the pointers from turning relatively to the bar.

3. A device of the character described comprising a bar formed of coextensive sections arranged in superposed spaced relationship, an elongated member forming a tongue having one end disposed between and pivotally connected to corresponding ends of said bar sections. said bar having related scales for indicating therise, hypothenuse and pitch of a triangle having a 12 inch base, a slide mounted in the sections for movement longitudinally oi the bar, pointers carried by the slide for indicating related markings of the scales when the slide is moved to any position relatively to the bar, an arm pivotally connected at one end to the tongue and pivotally connected at its opposite end to the slide, said tongue having an enlarged inner, pivoted end, semi-circular in shape and containing degree markings, the outer edge of the enlarged inner end of the tongue forming an inwardly curved continuation of the outer edge of the tongue, said inner end of the tongue being arranged so that no part thereof will extend beyond the plane `of the outer edge of the bar, and an arrow inscribed on the upper section of the bar and arranged to cooperate with said degree markings to form a protractor for use in conjunction with 

